Xylem e-IXP, Дополнительные инструкции по установке, эксплуатации и обслуживанию

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en – Original Instructions
e-IXP, e-IXPC, e-IXPF series – Additional Installation, Operation and Maintenance Instructions 31
7.5 The thermal overload protection triggers or the fuses trip
The motor thermal overload protection triggers or the fuses trip when the unit starts.
Cause Solution
It is calibrated at a value too low in relation to the rated current of
the motor Recalibrate
Missing power supply phase Check the power supply and restore the phase
Loose and/or faulty connections of the thermal overload protection Tighten or replace the clamps and terminals
Loose and/or incorrect and/or faulty (star-delta) connections in the
terminal board of the motor
Tighten or replace the clamps and terminals
Motor (coil) faulty Check and repair or replace the motor
Pump unit mechanically seized Check and repair the pump unit
Check valve faulty Replace the check valve
Foot check valve faulty Replace the foot valve
7.6 The thermal overload protection triggers
The motor thermal overload protection triggers occasionally, or after the unit has been
running for a few minutes.
Cause Solution
It is calibrated at a value too low in relation to the rated current of
the motor Recalibrate
Input voltage outside the rated limits Make sure the voltage values are correct
Unbalanced input voltage Make sure the voltage of the three phases is balanced
Wrong duty point, flow rate above the permitted limits Bring the flow rate back within the permitted limits
Liquid too thick Check the liquid
Room temperature too high Decrease the temperature
Unit faulty Contact Xylem or the Authorised Distributor
7.7 The motor becomes excessively hot
Cause Solution
Room temperature too high Decrease the temperature
Motor cooling fan damaged Replace the cooling fan
Too many starts See paragraph 7.10
Frequency converter wrongly calibrated (if present) See the frequency converter manual
7.8 Little or no hydraulic performance
Cause Solution
Three-phase motor turning in the wrong direction Check the direction of rotation and change if necessary
Incorrect priming (there are air bubbles in the suction pipe or in the
unit)
Repeat the priming procedure
Cavitation Increase the NPSH
3
available in the system
Check valve blocked or partially clogged Replace the check valve
Discharge pipe throttled Remove the throttling
Piping and/or unit clogged Remove the clogging
3
Net Positive Suction Head